Heater



. R. J. GREVSTAD HEATER Filed March 22. 1926 INVENTOR ATTORNEY Patented Nov. 9, 1926.

RICHARD J. GREVSTAD, or minus, WASHINGTON.

HEATER.

Application filed March 22, 1926. Serial No; 96,448.

This invention relates to air-heating apparatus for use, moreparticularly, with broodcrs and the like.

The object of my invention is to provide 6 apparatus of this character which'will be of inexpensive construction, efficient in use, and convenient to control.

More specific objects and advantages of the invcntionfwill appear in the following 1o description.

The invention consists in the novel con struction, adaptation and combination of parts hereinafter described and claimed.

In the accompanying drawing,

Figurel is a transverse verticalsection of an air-heating device embodying the present invention, said section being taken sub stantially on line 11 of Fig. 2; and Fig. 2 is a horizontal section on line 22 of Fig; l.

In said drawing, the reference numeral 5 indicates a casing containing two compartments 6 and 7 disposed one above the other.

The lower compartment 6, which serves as a heating chamber, is open at the bottom and is provided with an 'imperforate peripheral wall 8 and a top wall or ceiling 9 having a central aperture'13.

The upper compartment 7, which serves as a hot-air reservoir, is provided with an imperforate peripheral wall 10, and a floor 11 and a top wall 12, each having a central aperture. Communication is had between the, top of the heating chamber 6 and the hot-air reservoir 7 lhrougha passageafforded by said aperture 13; and an outlet 14 is provided through the aperture in the top wall 12 of said reservoir for the delivery of hot air from the latter as, for example, into a service pipe 15. v

This service pipe is' extended to'. the brooder or other place which to be heated and should be provided in proximity of its outlet with a damper of known or suitable construction which is not shown in the drawmg. r

As illustrated, the walls 9 and 11 of the respective compartments are joined together about the periphery of the passage 13, such walls being formed, preferably, to diverge from each other radially outward from their connection to a maximum opening 16 at the circumference of the casing. The annular zone or space 17 between said compartments constitutes what will hereinafter be termed the smoke space,

Depending from the top wall 9 of the heating chamber 6 and communicating with the smoke space 17 are vertically disposed smoke conducting fiues 18, threebeing shown in respective lines 18 and extending upwardly.

into the same are burners 19, preferably oil burners of known or suitableconstruction, which are shown as associated with an oil supply tank 20. i

As illustrated, said oil supply tank is held by a shelf 21 which is supported as by means of hanger rods 22 loosely connected to eye attachments 23 of the casing and having hooksor knobs, as 24, which are engageable in slotted ear elements 25 of said shelf. Damper plates 26 are provided for the respective flues .18, said damper plates being located preferably. in the smoke space 17 above the respective fines and are arranged to be individually regulated from outside of the casing. 27 represents air down-flow pipes extending from the outer portion of the hotair reservoir through the smoke space 17 into the heating chamber wherein said down-flow pipes terminate withopen ends in proximity of the lower edge of the wall 8.' These pipes are desirably secured by weldmg or otherwise to the inner surface of the wall 8 thereby serving as ribs to reinforce the wall; The apparatus above described maybe supported 1n any su1tablemanner as, for example, by means of legs 28 resting upon the floor or ground and having their upper ends bolted or otherwise secured to lug attachments 29 of the casing. In case it is desired to suspend the apparatus from an overhead support, hangers (not shown) may be employed, the lower ends'of which are engaged to the casing attachments 29.

The apparatus may be of any suitable dimensions and constructed of iron or other suitable material. The outer surfacesof the peripheral walls 8'and'1O and of the-top wall12 of the casing may be advantageouslycapes radially outward into the surrounding atmosphere.

The heat generated at the burners is con veyed by the smoke and some air upwardly through the fines subject, however, to the draft control afforded by the dampers 26. The hot combustion products travelling through the fines causes the same to become hot and effect the heating of the air surrounding the dues within the chamber 6; the residual heat discharging into the space 17 is utilized most elfectively against the fioor'll of the chamber 7 to heat the air therein.

The air surrounding the fiues upon becoming heated ascends through the passages 13 into the central region of the reservoir chamber and thence through the discharge passage 14.- into the service pipe 15.

The heated air entering through passage 13 into the reservoir chamber, by reason of the down-flow of air through the pipes 27, tends to be drawn toward the periphery of the chamber 7, some of which air descending through such down-flow pipes into the lower portion of the chamber 6 coacting with the upflowing hotter air to create a circulation of'air within the interior of the casing. casing and between its chambers 6 and 7 ettects a substantially uniform temperature throughout the two chambers, 6 and 7 when the discharge from the service pipe is stopped, or nearly so, whereupon the heating chamber 6 acts as a reservoir for hot air supplementary to the chamber 7. The heat: ing surfaces afforded by the fines 18 and the floor of the reservoir chamber 7, taken in connectionwith the air distribution due to the circulation above referred to, ensures a most is withdrawn for use from the apparatus.

The air from below the plane of the lower edge of the wall 8 supplies air to the burners for combustion purposes. The burnt or partly burnt air being carried up the respective fiues cannot vitiate the air supply which passes through the hot air reservoir.

While I have illustrated the invention in an embodiment now preferred by me I do not wish to be understood as confining myself thereto as changes may be made within the scope of the following claims. 7

Such circulation of air within the.

Vihat I claim, is,-

1. In a heater, the combination with a liquid-fuel reservoir having a plurality of burners, of a casing disposed in spaced relation abovesaid reservoir, said casing being provided with a plurality of substantially horizontal walls dividing the easing into an air-heatingchamber, an annular smoke receiving space open to the atmosphere surrounding the casing, and a hot-air chamber disposed successively one above another, smoke fines extending from the respective burners upwardly through said heating chamber and terminating in said sp ce below the floor wall of the hot-air chamber,

and damper devices for the respective tlues, said hot-air chamber having an air-inlet and an air outlet.

2. In a heater, the combination with a liquid-fuel reservoir having a plurality of? burners, of a casing disposed in spaced relaair-outlets extending downwardly from said hot-air chamber into said heating chamber.

3. A heater comprising a cylindrical casing divided into a bottomless air-heating chamber, a hot-air chamber provided with an air-outlet and having direct communication with the heating chamber, and an I nular space between said chambers, space being open circumferentially of the casing, fines extending downwardly from said annular space into said heating cha1nher, said flues being adapted to receive burners in their lower ends, and air down flow pipes ext-ending from the hot-air chamher into the heating chamber and terminating in spaced relation from tie lower end of the heating chamber. i l e Signed at Seattle, Vvashington, this 16th day oi January, 1926.

Brennan J. eanvsran 

